I agree with what all of you stated, however the whole reason behind why I'm asking about the temp range is that if I was building a model of a radial engined plane there would be no issues but project I'm planning will have the engine severely faired in behind a cowling and so I am concerned with the airflow. Therefore even if I have the engine properly tuned and with the right prop it will still not tell me if it's getting enough cooling airflow while in operation (unless it is severely overheating of course). That's why I wanted to get the typical temp ranges for a 4 stroke so that I can monitor the temp while in operation to determine if the engine is getting enouigh cooling.